Value Analyses Of 0-3 Type Piezo-composite And The Optimized Processing To Fabricate The Materials

Despite there are many investigation around piezo-composite materials, the obstacle still stands there that how to enhance the piezoelectric property of piezo-composites. In order to work out the question, several academic composite models were setup according to some ordinary laws in this thesis, so that data can be analysis to find out the optimizing ways to enhance the characteristics of the material. According to these models, permittivity, piezoelectricity, Young's module as well as particle size of the components affected the piezoelectricity of composite commonly. In order to raise the piezoelectric constant of composite, many aspects should be paid attention to.The permittivity of component determined the electric distribution in the composite, which held up the electric field while polarizing the material or pushing/pulling the material. According to non-organ/organ composite, since the organ part took on lower permittivity, it inclined to hold on most potential, making the piezoelectricity of composite deteriorate. Thus, it is significant to diminish the permittivity of ceramic powders and to employ polymers with high dielectric constant as the component of piezo-composite.Nor can fine piezoelectricity be gained while all components prompted high piezoelectric constant in piezo-composite. There is a great defective that the piezoelectric constant of ceramics and polymers hold opposite symbol while they are polarized at same time. There exist 3 routine to overcome the defective: (a) diminishing the piezoelectricity of polymers; (b) raising the piezoelectricity of ceramic powders; (c) employing twice polarization processing, which makes the both components prompt piezoelectric constant with same symbol.The difference of elastic module between components brought to loose connectivity between them. As to 0-3 type composite, the stresses deliver through space network constructed by the polymer. Whereas, the wide gap module delayed those inner stress delivering. While the stresses were cut down in ceramic particles which took part in themost piezoelectric effect, the piezoelectricity of composite deteriorated.Either did the particle sizes and shapes influence on the piezoelectricity of composites. The investments on piezoelectric constant of components were not the same according to their stackers. Since the particles permute different orders with different proceeding, the piezo properties separated. When composites contained less non-organic components, particles inclined to disperse each other. However, the space can not accommodate all particles as the concentration of ceramic grown too high. Their distribution trends to be restricted and the most density stackers were the ultimate formation. Among all those stackers, particle size always took roles. It was benefit for piezoelectricity that employing particles with different sizes and inducing those small ones residing tolerance constructed by the bigger stackers. Although reducing the particles' dimension could enhance the piezo-property of composite, the function was low efficient.Piezoelectric ceramics were fabricated according to the analyzed data. The experiments, procedures and the dopants were also determined at the same time. After combining ceramic powders and PVDF, the piezo-composites were obtained. By testing their properties, it was illustrated that the piezoelectricity of innovated composite had been enhanced...